"There's nothing to show any type of trauma or any kind of injury," said Capt. Robert Lawrence of the La Crosse Police Department. "There's no part of our investigation that shows that. (But) we're going to continue to try to put together the entire timeline."

La Crosse County Medical Examiner Tim Candahl said the autopsy did not reveal when Augustine died.

While they don't suspect foul play, police are still trying to piece together what happened after Augustine left his friends at a marina near the Black River beach late Tuesday night after a day of boating.

He told his friends he planned to walk to his house about five miles away on the South Side.

Lawrence confirmed that Augustine's body was found upstream of the marina but said it's not clear where he entered the water.

"We're still looking for a lot of pieces of the puzzle," he said.

While most drowning victims are recovered downstream from where they enter the water, one search and rescue expert said river currents can carry bodies upstream.

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"It wouldn't be uncommon for a body that was (near shore) to move back upstream, depending on how strong the current is," said David Owens, a trainer with Diver Rescue International of Fort Collins, Colo., and communications director for the International Association of Dive Rescue Specialists.

That's because water doesn't simply flow straight downstream.

"There's a lot more chaos in the flow of water, in rivers especially, than a lot of people think," said Roger Haro, a professor of biology who teaches stream and watershed ecology at the University of Wisconsin-La Crosse. "It's a chaotic situation under the water."

Augustine, who came to La Crosse with his family from his native Pakistan at age 13, served as an acolyte at Christ Episcopal Church, where both his father and uncle were priests.

He was a popular bartender at Huck Finn's on the River and Pogreba Restaurant and planned to enroll at Western Technical College this fall to study physical therapy.

Augustine had been drinking, police said, but it could be weeks before toxicology tests show just how impaired he was.

"We have an idea (that he had been drinking)," Lawrence said. "We're talking to people -- how long were they out and about ... We have a pretty good idea, but we don't go by hunches or speculation. We go by the facts."

Nevertheless, Lawrence said Augustine's death fits a pattern.

Since 1997, at least nine college-age men have drowned in La Crosse rivers while on foot. One young woman died of exposure after wandering from an Onalaska bar, and other drowned on New Year's day in 2014 after her car careened down an embankment and into the river.

All had blood alcohol levels at least twice the legal limit for driving.

"There's no mystery to some of these," Lawrence said. "There's other ones where we don't have all the facts that we would otherwise (like)... but there's nothing to indicated foul play."

Police are reviewing phone and video records in hopes of piecing together his last moments. They released a full photo of Augustine taken the day he disappeared and are asking anyone who may have seen him to call 608-785-5962 with information.